Note that pow(0, 0) equals to 1 although mathematically this is undefined.
(PHP 4, PHP 5, PHP 7, PHP 8)
pow — Exponential expression
Returns num raised to the power of
exponent.
Зауваження:
It is possible to use the ** operator instead.
numThe base to use
exponentThe exponent
num raised to the power of exponent.
If both arguments are non-negative integers and the result can be represented
as an integer, the result will be returned with int type,
otherwise it will be returned as a float.
PHP-Extensions may override the behaviour of this operation and make it return an object.
| Версія | Опис |
|---|---|
| 8.4.0 |
Raising 0 to a negative
exponent is now deprecated.
|
Приклад #1 Some examples of pow()
<?php
var_dump(pow(2, 8)); // int(256)
echo pow(-1, 20), PHP_EOL; // 1
echo pow(0, 0), PHP_EOL; // 1
echo pow(10, -1), PHP_EOL; // 0.1
echo pow(-1, 5.5), PHP_EOL; // NAN
?>
Приклад #2 Examples of pow() With GMP Extension Object
<?php
var_dump(pow(new GMP("3"), new GMP("2"))); // object(GMP)
?>Зауваження:
This function will convert all input to a number, even non-scalar values, which could lead to weird results.
Note that pow(0, 0) equals to 1 although mathematically this is undefined.